Revert "spec: add conflict with bind-chroot to freeipa-server-dns"
Remove the conflict, as bind-chroot caused issue only on systems with older
bind and bind-chroot - e.g. RHEL 6.
This reverts commit 3ab63fa6ba60947b1452c2108c4cf7637f4aacdb.
https://fedorahosted.org/freeipa/ticket/5696
Reviewed-By: Petr Spacek <pspacek@redhat.com>